Patents by Inventor Yoshimi Katoh

Yoshimi Katoh has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Optical recording media and information recording and reproducing units
    Patent number: 5484686
    Abstract: The present invention provides an optical recording medium using an amorphous-crystalline phase-change for recording and erasing, wherein reflectivity of an optical recording medium-constituting recording film in an amorphous state is larger than that of the optical recording medium-constituting recording film in a crystalline state, or wherein absorptivity of an optical recording medium-constituting recording film in an amorphous state is smaller than that of the optical recording medium-constituting recording film in a crystalline state.
    Type: Grant
    Filed: March 4, 1994
    Date of Patent: January 16, 1996
    Assignee: Hitachi, Ltd.
    Inventors: Yoshihito Maeda, Isao Ikuta, Hisashi Andoh, Masaichi Nagai, Yoshimi Katoh, Yoshio Sato, Nobuyoshi Tsuboi, Hiroyuki Minemura
  • Fortune telling device
    Patent number: D455808
    Type: Grant
    Filed: April 9, 2001
    Date of Patent: April 16, 2002
    Inventors: Yoshimi Katoh, Satoshi Sugiyama
  • Optical recording media and information recording and reproducing units
    Patent number: RE36624
    Abstract: The present invention provides an optical recording medium using an amorphous-crystalline phase-change for recording and erasing, wherein reflectivity of an optical recording medium-constituting recording film in an amorphous state is larger than that of the optical recording medium-constituting recording film in a crystalline state, or wherein absorptivity of an optical recording medium-constituting recording film in an amorphous state is smaller than that of the optical recording medium-constituting recording film in a crystalline state.
    Type: Grant
    Filed: January 15, 1998
    Date of Patent: March 21, 2000
    Assignee: Hitachi, Ltd.
    Inventors: Yoshihito Maeda, Isao Ikuta, Hisashi Andoh, Masaichi Nagai, Yoshimi Katoh, Yoshio Sato, Nobuyoshi Tsuboi, Hiroyuki Minemura